I agree with KP, after reading her post, because there is indeed a chance that Tom's departure will serve as a much-needed wake up call to both women. This being said, one could argue that once Amanda finds herself in a position of sole power she may even push Laura forward to build a better future together.
Amanda does have the capability of leading. She simply relies too much on Tom. There is evidence that she knows how to move around in life. She knows where the vocational institute is, and the benefits that she could obtain from finishing a certification there. So, in all, I feel that Amanda will probably end up supporting herself and Laura by finding a job, perhaps doing the same type of work that she wished for Laura to do. As for Laura, I have always said that she needs more tough love than her mother gives her. Maybe once she sees how hard her mother works for the two of them she will wake up and quit her social anxiety for good. I will be honest: I have never sympathized with the character of Laura. I feel that she can choose to behave differently if something drastic occurs. Perhaps Tom's departure is what she needs to snap out of her typical behavior.